<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
     /* 
       颜色
       red ->纯色
       #ff2d51
       rgb()
        */
     p{
         color: palevioletred;
         background: #1fff;
     }
     div{
         width: 100px;
         height: 100px;
         background: rgba(255, 33, 66, 1.5);
     }
    </style>
</head>
<body>
    <div class="p">    
       <p> hello world!</p> </div>
    <div> </div>
</body>
</html>